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US 2023/0175531 A1Published application
Control system for actuating lifting function
AssigneeDanfoss Power Solutions Inc.
InventorsAaron Darnell, Zhekang Du, Simon Nielsen
Life of this patent
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Abstract
A hydraulic control system for linear actuation that provides a bypass flow during startup of a lifting command, provides a split flow between a cylinder and a reservoir once a minimum operating speed of a pump has been reached, and provides complete flow to a cylinder after the minimum operating speed of the pump has been reached. This is achieved through control of a flow control valve and a proportional flow control valve by a processor.
Claims9
A hydraulic control system for linear actuation, comprising:
- an electric motor connected to a hydraulic pump;
- a hydraulic cylinder connected to the pump via a flow line;
- a pressure transducer, a pressure control valve, and a check valve connected to the flow line between the pump and the cylinder;
- a tank connected to the pump and to the cylinder via a return line;
- a control valve connected to the flow line between the check valve 24 and the pump and also connected to the return line;
- a proportional control valve connected to the flow line between the check valve and the pressure control valve and also connected to the return line;
- and the proportional control valve connected to a processor having software to control the system state during startup of lifting command and during operation at commanded lifting speeds requiring pump speeds less than the minimum pump operating speed.
4 more elements
Dependencies are inferred from the claim text.